99% first try. No surprise since I not only grew up on survival stories and woodcraft, I have some first-hand practical knowledge of such too. I do disagree with it a bit since it’s setting a hard limit on the items you can take, and people can be quite creative with minimal tools if they have to be. That said, it’s a game, and by setting that limit they are forcing you to prioritize.
Some responses to the complaints that some items seem more useful than they rate them: The fishing kit might be useful, but probably not. First of all, you’ve got no bait, at least until you catch your first fish; then you can use its guts for bait. You’re more likely to lose your piece of C-ration if you use that for bait, and anyway that stuff is usually semi-solid mushy gunk. Good luck using that. Second, line fishing is inefficient at best, and often completely useless unless fish stocks are teeming.
The problem with using the netting is that you have no weights, and in any case most people aren’t going to have the skills to either rig it for static catching, or for throwing. If you had a spear or something to make one, you’d be much better off fishing with that than either a net or line. Faster, less left to chance, and not particularly hard to master. Of course, in the scenario you don’t have the stuff to make a spear fishing rig.
A sextant is mostly useless without an accurate clock and either tables for figuring out the longitude from the angle, or the mathematical knowledge of how to derive the figures from your readings. If you’ve got the navigational know-how, all that you can realistically accomplish is to know where you are as you’re dying because you left other, more useful stuff behind. Like earlier posters said, knowing where you are and where you’re going is only useful if you can affect your course. In this case, you can’t, so the sextant and map are worthless except for initial mental comfort.
You should never, ever, in a million years, pass up a sure source of water for hypothetical potential water in the future. Can you make a solar still? Have you done so? Tested it? Made sure it works with sea water? Do you know how much you can process and in what time period with the rig you have? Even if you said yes to all these questions, the 5 gallons of water is probably more important than everything else they give you for survival purposes put together.
Water is absolutely the most important thing in a survival situation. You can survive with no food for days or weeks. You can survive a surprising amount of exposure to the elements, though you won’t be very comfortable. But without water, you’ve got a couple of days, at best, before you’re dead. Solar stills provide a trickle of water that takes a long time to accumulate. With that 5 gallon head-start, you might not be dangerously thirsty for a while if you are lucky and you do a great job with the rig. The still will only ever be a supplement to keep a diminishing water store from being exhausted very quickly and would never replace a ready source of water.